Engine - Internal reciprocating Noise
87pontiac13 Number 86-6(Gasoline)-83 Date 12/87Subject: ENGINE NOISE CAUSED BY WORN PISTON PIN
1985/86 SUNBIRD MODELS (ENGINE VIN CODE P)
A customer comment of engine noise that is identified as an internal reciprocating noise may or may not be caused by a worn piston/piston pin interface.
If the piston is suspected of causing a cold and hot noise complaint, then the piston/piston pin interface should be examined for wear, i.e., out-of-round or grooving. The service manual procedures in Section 6A should be followed for removal and inspection of the piston and pin.
If wear conditions indicate a need for piston and pin assembly replacement, then one of the following new piston and pin assemblies should be used for the respective cylinder:
Standard Piston/Pin Asm. = P/N 10103570 High-Limit Piston/Pin Asm. = P/N 10103571 0.5 mm Oversize Piston/Pin Asm. = P/N 10103572 1.0 mm Oversize Piston/Pin Asm. = P/N 10103573
Select the piston/pin assembly by using the procedure described under "Piston Fitting" in Section 6A of the service manual for 2.0L engines.